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Pchlide reduction in the penultimate step of Chl a biosynthesis. In cyanobacteria, Pchlide is reduced by two evolutionarily unrelated enzymes, DPOR and LPOR. DPOR is a nitrogenase-like enzyme consisting of L-protein (ChlL dimer) and NB-protein (ChlN-ChlB heterotetramer). DPOR requires reduced ferredoxin (Fd) and ATP for catalysis. LPOR is a single polypeptide enzyme that uses NADPH as the reductant. Light is required for the catalysis of LPOR.
